update dependencies, use common plugin

src/commonMain/kotlin/com/infendro/otp/HOTP.kt

@@ -1,19 +1,20 @@
 package com.infendro.otp
 
-import com.infendro.bytearray.toByteArray
 import com.infendro.bytearray.toInt
+import com.infendro.bytearray.toUByteArray
 import com.infendro.hash.HashFunction
-import com.infendro.hash.SHA1
+import com.infendro.hash.sha1.SHA1
 import com.infendro.mac.HMAC
-import kotlin.experimental.and
 import kotlin.math.pow
 
 class HOTP(
     val function: HashFunction = SHA1,
     val length: Int = 6,
 ) {
+    private val hmac = HMAC(function)
+
     fun verify(
-        secret: ByteArray,
+        secret: UByteArray,
         counter: Long,
         otp: String,
     ): Boolean {
@@ -21,33 +22,31 @@ class HOTP(
     }
 
     fun generate(
-        secret: ByteArray,
+        secret: UByteArray,
         counter: Long,
     ): String {
-        if (counter < 0) throw Exception()
+        if (counter < 0)
+            throw IllegalArgumentException()
 
-        val hash = generateHash(
-            secret,
-            counter.toByteArray()
-        )
+        val hash = generateHash(secret, counter.toUByteArray())
         return otp(hash)
     }
 
     private fun generateHash(
-        secret: ByteArray,
-        value: ByteArray,
-    ): ByteArray {
-        return HMAC(function).hash(secret, value)
+        secret: UByteArray,
+        value: UByteArray,
+    ): UByteArray {
+        return hmac.hash(secret, value)
     }
 
     private fun otp(
-        hash: ByteArray,
+        hash: UByteArray,
     ): String {
-        val offset = (hash.last() and 0xF).toInt()
+        val offset = (hash.last() and 0xFU).toInt()
 
         var truncatedHash = hash
-            .drop(offset)
-            .take(4)
+            .drop(offset).take(4)
+            .toUByteArray()
             .toInt() and 0x7FFFFFFF
         truncatedHash %= 10.0.pow(length).toInt()